Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Simple Poll - The easiest way to create polls in Slack
Event Hunt - Startups and Tech Events Curated By Locals
GitHub Polls - Polls for GitHub issues and readme
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
minipoll - Create simple shareable polls in seconds